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Check the coolant temp. sensor (It controls warm up RPM, open loop ECU mode) And change the fuel filter every 20,000 miles to prevent water in filter from freezing ( fuel starvation).
I had that problem for the longest time. I had to clean the Mass Air Flow Sensor. Very easy to get to. Go to any auto parts store and ask them for the MAFS Spray. If cleaning it doesn't work, you may need to replace the MAFS. Once again easy to replace. Make sure you put it back nice and tight.....
oil drop from the valve stem (from engine head to cyclinders)
or
diesel soot collect inside the exhaust system.
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I will take a 5-10 minutes high rpm (not redline) ran on the highway.
Pay close attention to the rear view mirror and look for black diesel soot.
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I will use Diesel Cleen or similar product to condition the fuel. (keep moisture down)
Use the recommended amount of SEAFOAM oil additive to condition the valve stem seal/rubber parts.
I can not rule out excessive blown by.
Can you get a diesel compression tester?
When was the last valve adjustment?
Please post the actual odometer on the engine and I will follow up on it.
my beetle stop idling after motor warms up
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